Composition for forming lens, and Fresnel lens and transmission screen using said composition

Abstract

The invention discloses a composition for forming lens, which contains urethane acrylate prepolymer based on tolylenediisocyanate as a principal material, and further said composition containing brome acrylate at least by 10 to 40 weight %, caprolactone denatured hydroxypivalic acid ester neopentylglycoldiacrylate by 3 to 20 weight %, and bis-(acryloxyethoxy)bisphenol A by 3 to 60 weight %, and refractive index of said cured product being 1.5 or more, further discloses a Fresnel lens using said composition, and a transmission screen 1, in which a Fresnel lens 3 is formed on a base material 2.

What we claim is: 
     
       1. A transmission screen, in which a Fresnel lens is laminated with a base material, said Fresnel lens being formed by a composition for forming lens, containing UV-setting prepolymer based on tolylenediisocyanate as principal material, and further containing brome acrylate by 10 to 40 weight %. 
     
     
       2. A transmission screen, in which a Fresnel lens is laminated on a base material, said Fresnel lens being formed by a composition for forming a lens according to claim 1, wherein said composition further comprises caprolactone denatured hydroxypivalic acid ester neopentylglycoldiacrylate by 3 to 20 weight %. 
     
     
       3. A transmission screen, in which a Fresnel lens is laminated on a base material, said Fresnel lens being formed by a composition for forming a lens according to claim 1 or 2, wherein said composition further comprises a reactive diluent of bis(acryloxyethoxy)-bisphenol A by 3 to 60 weight %. 
     
     
       4. A transmission screen, in which a Fresnel lens is laminated on a base material, said Fresnel lens being formed by a composition for forming a lens according to claim 1, wherein said composition further comprises pentaerythritol 4-functional monomer by 1 to 4 weight %. 
     
     
       5. A transmission screen, in which a Fresnel lens is laminated on a base material, said Fresnel lens being formed by a composition for forming a lens according to claim 2, wherein said composition further comprises pentaerythritol 4-functional monomer by 1 to 4 weight %. 
     
     
       6. A transmission screen, in which a Fresnel lens is laminated on a base material, said Fresnel lens being formed by a composition for forming a lens according to claim 3, wherein said composition further comprises pentaerythritol 4-functional monomer by 1 to 4 weight %. 
     
     
       7. A method of forming a transmission screen, in which a Fresnel lens is laminated on a base material, said Fresnel lens being formed by the steps of: providing a UV-setting prepolymer resin composition based upon tolylenediisocyanate, which contains a brome acrylate compound of 10 to 40 weight % and a reactive diluent of 3 to 60 weight %,   supplying said resin composition to a lens forming mold, and   curing said resin composition in the mold by UV irradiation.   
     
     
       8. A method of forming a transmission screen according to claim 7, wherein the reactive diluent provided is bis-(acryloxyethoxy)-bisphenol A. 
     
     
       9. A method of forming a transmission screen according to any one of claims 7 to 8 further comprising providing said resin composition with caprolactone denatured hydroxypivalic acid ester neopentylglycoldiacrylate of 3 to 20 weight %. 
     
     
       10. A method of forming a transmission screen according to claim 9 further comprising providing said resin composition with pentaerythritol 4-functional monomer of 1 to 4 weight %.